java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-EXP.epf -i ../../../trunk/examples/svcomp/loop-acceleration/simple_false-unreach-call1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-df4b876 [2018-11-07 10:31:28,624 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-07 10:31:28,626 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-07 10:31:28,642 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-07 10:31:28,643 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-07 10:31:28,644 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-07 10:31:28,645 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-07 10:31:28,647 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-07 10:31:28,648 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-07 10:31:28,649 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-07 10:31:28,650 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-07 10:31:28,650 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-07 10:31:28,651 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-07 10:31:28,652 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-07 10:31:28,653 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-07 10:31:28,654 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-07 10:31:28,655 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-07 10:31:28,657 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-07 10:31:28,659 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-07 10:31:28,660 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-07 10:31:28,661 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-07 10:31:28,663 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-07 10:31:28,665 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-11-07 10:31:28,665 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-11-07 10:31:28,666 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-11-07 10:31:28,667 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-11-07 10:31:28,668 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-11-07 10:31:28,669 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-11-07 10:31:28,669 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-11-07 10:31:28,671 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-11-07 10:31:28,671 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-11-07 10:31:28,672 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-11-07 10:31:28,674 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-EXP.epf [2018-11-07 10:31:28,689 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-07 10:31:28,689 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-07 10:31:28,690 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-11-07 10:31:28,690 INFO L133 SettingsManager]: * User list type=DISABLED [2018-11-07 10:31:28,691 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-11-07 10:31:28,691 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-11-07 10:31:28,691 INFO L133 SettingsManager]: * Explicit value domain=true [2018-11-07 10:31:28,691 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-11-07 10:31:28,691 INFO L133 SettingsManager]: * Octagon Domain=false [2018-11-07 10:31:28,692 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-11-07 10:31:28,692 INFO L133 SettingsManager]: * Log string format=TERM [2018-11-07 10:31:28,692 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-11-07 10:31:28,692 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-11-07 10:31:28,692 INFO L133 SettingsManager]: * Interval Domain=false [2018-11-07 10:31:28,693 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-07 10:31:28,693 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-11-07 10:31:28,693 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-07 10:31:28,694 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-11-07 10:31:28,694 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-11-07 10:31:28,694 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-11-07 10:31:28,694 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-07 10:31:28,694 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-11-07 10:31:28,695 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-07 10:31:28,695 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-07 10:31:28,695 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-11-07 10:31:28,695 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-11-07 10:31:28,695 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-07 10:31:28,696 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-07 10:31:28,696 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-11-07 10:31:28,696 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-11-07 10:31:28,696 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-11-07 10:31:28,696 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-11-07 10:31:28,697 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-11-07 10:31:28,697 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-11-07 10:31:28,697 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-11-07 10:31:28,697 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-11-07 10:31:28,741 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-07 10:31:28,759 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-07 10:31:28,764 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-07 10:31:28,766 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-07 10:31:28,766 INFO L276 PluginConnector]: CDTParser initialized [2018-11-07 10:31:28,767 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/simple_false-unreach-call1.i [2018-11-07 10:31:28,836 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8b6248dde/fd275a92fb0346f9935d71a166c300a9/FLAGeb2815b4d [2018-11-07 10:31:29,293 INFO L298 CDTParser]: Found 1 translation units. [2018-11-07 10:31:29,294 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/simple_false-unreach-call1.i [2018-11-07 10:31:29,300 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8b6248dde/fd275a92fb0346f9935d71a166c300a9/FLAGeb2815b4d [2018-11-07 10:31:29,316 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8b6248dde/fd275a92fb0346f9935d71a166c300a9 [2018-11-07 10:31:29,326 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-07 10:31:29,328 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-11-07 10:31:29,329 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-07 10:31:29,329 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-07 10:31:29,334 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-07 10:31:29,335 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 10:31:29" (1/1) ... [2018-11-07 10:31:29,338 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@378b024b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:31:29, skipping insertion in model container [2018-11-07 10:31:29,338 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 10:31:29" (1/1) ... [2018-11-07 10:31:29,349 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-07 10:31:29,371 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-11-07 10:31:29,542 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-07 10:31:29,546 INFO L189 MainTranslator]: Completed pre-run [2018-11-07 10:31:29,561 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-07 10:31:29,576 INFO L193 MainTranslator]: Completed translation [2018-11-07 10:31:29,577 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:31:29 WrapperNode [2018-11-07 10:31:29,577 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-07 10:31:29,578 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-11-07 10:31:29,578 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-11-07 10:31:29,578 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-11-07 10:31:29,588 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:31:29" (1/1) ... [2018-11-07 10:31:29,594 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:31:29" (1/1) ... [2018-11-07 10:31:29,600 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-11-07 10:31:29,600 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-07 10:31:29,600 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-07 10:31:29,601 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-07 10:31:29,614 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:31:29" (1/1) ... [2018-11-07 10:31:29,614 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:31:29" (1/1) ... [2018-11-07 10:31:29,615 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:31:29" (1/1) ... [2018-11-07 10:31:29,615 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:31:29" (1/1) ... [2018-11-07 10:31:29,620 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:31:29" (1/1) ... [2018-11-07 10:31:29,629 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:31:29" (1/1) ... [2018-11-07 10:31:29,630 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:31:29" (1/1) ... [2018-11-07 10:31:29,632 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-07 10:31:29,632 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-07 10:31:29,632 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-07 10:31:29,632 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-07 10:31:29,633 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:31:29" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-07 10:31:29,761 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-07 10:31:29,761 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-07 10:31:29,762 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-07 10:31:29,762 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-07 10:31:29,762 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-07 10:31:29,762 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-07 10:31:29,762 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-11-07 10:31:29,762 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-11-07 10:31:29,959 INFO L276 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-07 10:31:29,959 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 10:31:29 BoogieIcfgContainer [2018-11-07 10:31:29,960 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-07 10:31:29,960 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-11-07 10:31:29,961 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-11-07 10:31:29,964 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-11-07 10:31:29,964 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 10:31:29" (1/3) ... [2018-11-07 10:31:29,965 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@329b1b5a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 10:31:29, skipping insertion in model container [2018-11-07 10:31:29,965 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:31:29" (2/3) ... [2018-11-07 10:31:29,966 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@329b1b5a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 10:31:29, skipping insertion in model container [2018-11-07 10:31:29,966 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 10:31:29" (3/3) ... [2018-11-07 10:31:29,967 INFO L112 eAbstractionObserver]: Analyzing ICFG simple_false-unreach-call1.i [2018-11-07 10:31:29,977 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-11-07 10:31:29,984 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-11-07 10:31:29,998 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-11-07 10:31:30,032 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-11-07 10:31:30,033 INFO L383 AbstractCegarLoop]: Hoare is true [2018-11-07 10:31:30,033 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-11-07 10:31:30,033 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-11-07 10:31:30,033 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-11-07 10:31:30,033 INFO L387 AbstractCegarLoop]: Difference is false [2018-11-07 10:31:30,033 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-11-07 10:31:30,034 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-11-07 10:31:30,053 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states. [2018-11-07 10:31:30,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-11-07 10:31:30,060 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:31:30,061 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:31:30,063 INFO L423 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:31:30,069 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:31:30,070 INFO L82 PathProgramCache]: Analyzing trace with hash -10373566, now seen corresponding path program 1 times [2018-11-07 10:31:30,073 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:31:30,122 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:31:30,122 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 10:31:30,122 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:31:30,122 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:31:30,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:31:30,173 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:31:30,175 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-07 10:31:30,175 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-11-07 10:31:30,176 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 10:31:30,179 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-11-07 10:31:30,191 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-11-07 10:31:30,191 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-11-07 10:31:30,194 INFO L87 Difference]: Start difference. First operand 18 states. Second operand 2 states. [2018-11-07 10:31:30,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:31:30,214 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2018-11-07 10:31:30,215 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-11-07 10:31:30,216 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-11-07 10:31:30,216 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:31:30,224 INFO L225 Difference]: With dead ends: 29 [2018-11-07 10:31:30,224 INFO L226 Difference]: Without dead ends: 12 [2018-11-07 10:31:30,228 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-11-07 10:31:30,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2018-11-07 10:31:30,260 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2018-11-07 10:31:30,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-11-07 10:31:30,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2018-11-07 10:31:30,264 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2018-11-07 10:31:30,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:31:30,264 INFO L480 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2018-11-07 10:31:30,264 INFO L481 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-11-07 10:31:30,265 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2018-11-07 10:31:30,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-11-07 10:31:30,265 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:31:30,266 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:31:30,266 INFO L423 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:31:30,266 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:31:30,267 INFO L82 PathProgramCache]: Analyzing trace with hash -571410792, now seen corresponding path program 1 times [2018-11-07 10:31:30,267 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:31:30,268 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:31:30,268 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 10:31:30,268 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:31:30,269 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:31:30,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:31:30,435 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:31:30,435 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-07 10:31:30,435 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-11-07 10:31:30,436 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 10:31:30,437 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-11-07 10:31:30,438 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-11-07 10:31:30,438 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-07 10:31:30,439 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 3 states. [2018-11-07 10:31:30,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:31:30,483 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2018-11-07 10:31:30,483 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-11-07 10:31:30,484 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-11-07 10:31:30,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:31:30,485 INFO L225 Difference]: With dead ends: 19 [2018-11-07 10:31:30,485 INFO L226 Difference]: Without dead ends: 14 [2018-11-07 10:31:30,486 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-07 10:31:30,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-11-07 10:31:30,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-11-07 10:31:30,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-11-07 10:31:30,490 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2018-11-07 10:31:30,491 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 11 [2018-11-07 10:31:30,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:31:30,491 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2018-11-07 10:31:30,491 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-11-07 10:31:30,491 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2018-11-07 10:31:30,492 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-11-07 10:31:30,492 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:31:30,492 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:31:30,492 INFO L423 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:31:30,492 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:31:30,493 INFO L82 PathProgramCache]: Analyzing trace with hash 1625028318, now seen corresponding path program 1 times [2018-11-07 10:31:30,493 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:31:30,494 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:31:30,494 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 10:31:30,494 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:31:30,494 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:31:30,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:31:30,613 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:31:30,613 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:31:30,613 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:31:30,614 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 14 with the following transitions: [2018-11-07 10:31:30,616 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [20], [23], [25], [31], [32], [33], [35] [2018-11-07 10:31:30,655 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-11-07 10:31:30,655 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-07 10:31:30,900 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-07 10:31:30,902 INFO L272 AbstractInterpreter]: Visited 12 different actions 18 times. Merged at 2 different actions 4 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 2 variables. [2018-11-07 10:31:30,916 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:31:30,917 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-07 10:31:30,917 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:31:30,918 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 10:31:30,931 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 10:31:30,931 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 10:31:30,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:31:30,961 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:31:31,009 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:31:31,010 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:31:31,105 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:31:31,126 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:31:31,127 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 6 [2018-11-07 10:31:31,127 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:31:31,127 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-11-07 10:31:31,127 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-11-07 10:31:31,127 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-11-07 10:31:31,128 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 4 states. [2018-11-07 10:31:31,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:31:31,143 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-11-07 10:31:31,145 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-11-07 10:31:31,145 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 13 [2018-11-07 10:31:31,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:31:31,146 INFO L225 Difference]: With dead ends: 21 [2018-11-07 10:31:31,146 INFO L226 Difference]: Without dead ends: 16 [2018-11-07 10:31:31,146 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 24 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-11-07 10:31:31,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-11-07 10:31:31,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-11-07 10:31:31,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-11-07 10:31:31,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2018-11-07 10:31:31,151 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 13 [2018-11-07 10:31:31,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:31:31,151 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2018-11-07 10:31:31,152 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-11-07 10:31:31,152 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2018-11-07 10:31:31,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-11-07 10:31:31,152 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:31:31,153 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:31:31,154 INFO L423 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:31:31,154 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:31:31,154 INFO L82 PathProgramCache]: Analyzing trace with hash -720896604, now seen corresponding path program 2 times [2018-11-07 10:31:31,155 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:31:31,156 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:31:31,156 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 10:31:31,156 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:31:31,156 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:31:31,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:31:31,316 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:31:31,316 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:31:31,316 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:31:31,317 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:31:31,317 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:31:31,317 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:31:31,317 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 10:31:31,334 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 10:31:31,334 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 10:31:31,379 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-11-07 10:31:31,379 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 10:31:31,383 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:31:31,442 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:31:31,443 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:31:31,688 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:31:31,710 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:31:31,710 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2018-11-07 10:31:31,710 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:31:31,711 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-11-07 10:31:31,711 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-11-07 10:31:31,711 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-11-07 10:31:31,711 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 5 states. [2018-11-07 10:31:31,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:31:31,755 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2018-11-07 10:31:31,756 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-11-07 10:31:31,756 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2018-11-07 10:31:31,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:31:31,757 INFO L225 Difference]: With dead ends: 23 [2018-11-07 10:31:31,757 INFO L226 Difference]: Without dead ends: 18 [2018-11-07 10:31:31,758 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 27 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-11-07 10:31:31,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-11-07 10:31:31,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-11-07 10:31:31,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-11-07 10:31:31,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2018-11-07 10:31:31,762 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 15 [2018-11-07 10:31:31,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:31:31,763 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2018-11-07 10:31:31,763 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-11-07 10:31:31,763 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2018-11-07 10:31:31,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-11-07 10:31:31,764 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:31:31,764 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:31:31,764 INFO L423 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:31:31,765 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:31:31,765 INFO L82 PathProgramCache]: Analyzing trace with hash -296916246, now seen corresponding path program 3 times [2018-11-07 10:31:31,765 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:31:31,766 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:31:31,766 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 10:31:31,767 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:31:31,767 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:31:31,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:31:31,886 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:31:31,886 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:31:31,887 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:31:31,887 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:31:31,887 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:31:31,887 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:31:31,887 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 10:31:31,897 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 10:31:31,898 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 10:31:31,911 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 10:31:31,912 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 10:31:31,914 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:31:31,950 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:31:31,951 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:31:32,157 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:31:32,177 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:31:32,177 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2018-11-07 10:31:32,177 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:31:32,178 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-11-07 10:31:32,178 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-11-07 10:31:32,178 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-11-07 10:31:32,179 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 6 states. [2018-11-07 10:31:32,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:31:32,223 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2018-11-07 10:31:32,223 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-11-07 10:31:32,224 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 17 [2018-11-07 10:31:32,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:31:32,225 INFO L225 Difference]: With dead ends: 25 [2018-11-07 10:31:32,225 INFO L226 Difference]: Without dead ends: 20 [2018-11-07 10:31:32,226 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 30 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-11-07 10:31:32,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-11-07 10:31:32,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-11-07 10:31:32,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-11-07 10:31:32,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-11-07 10:31:32,231 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 17 [2018-11-07 10:31:32,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:31:32,231 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-11-07 10:31:32,231 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-11-07 10:31:32,232 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-11-07 10:31:32,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-11-07 10:31:32,233 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:31:32,233 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:31:32,233 INFO L423 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:31:32,234 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:31:32,234 INFO L82 PathProgramCache]: Analyzing trace with hash -873685328, now seen corresponding path program 4 times [2018-11-07 10:31:32,234 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:31:32,235 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:31:32,235 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 10:31:32,235 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:31:32,235 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:31:32,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:31:32,363 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:31:32,363 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:31:32,364 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:31:32,364 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:31:32,364 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:31:32,364 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:31:32,364 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 10:31:32,376 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 10:31:32,376 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 10:31:32,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:31:32,399 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:31:32,419 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:31:32,420 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:31:32,934 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:31:32,953 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:31:32,954 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 12 [2018-11-07 10:31:32,954 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:31:32,954 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-11-07 10:31:32,954 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-11-07 10:31:32,955 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-11-07 10:31:32,955 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 7 states. [2018-11-07 10:31:32,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:31:32,999 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-11-07 10:31:33,001 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-11-07 10:31:33,001 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 19 [2018-11-07 10:31:33,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:31:33,002 INFO L225 Difference]: With dead ends: 27 [2018-11-07 10:31:33,002 INFO L226 Difference]: Without dead ends: 22 [2018-11-07 10:31:33,003 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-11-07 10:31:33,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-11-07 10:31:33,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-11-07 10:31:33,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-11-07 10:31:33,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2018-11-07 10:31:33,008 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 19 [2018-11-07 10:31:33,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:31:33,008 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2018-11-07 10:31:33,008 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-11-07 10:31:33,008 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2018-11-07 10:31:33,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-11-07 10:31:33,009 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:31:33,009 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:31:33,010 INFO L423 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:31:33,010 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:31:33,010 INFO L82 PathProgramCache]: Analyzing trace with hash -1097991946, now seen corresponding path program 5 times [2018-11-07 10:31:33,010 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:31:33,011 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:31:33,011 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 10:31:33,011 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:31:33,011 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:31:33,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:31:33,244 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:31:33,245 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:31:33,245 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:31:33,245 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:31:33,245 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:31:33,245 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:31:33,245 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 10:31:33,254 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 10:31:33,254 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 10:31:33,403 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-11-07 10:31:33,403 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 10:31:33,405 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:31:33,417 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:31:33,417 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:31:33,598 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:31:33,618 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:31:33,619 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 14 [2018-11-07 10:31:33,619 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:31:33,619 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-11-07 10:31:33,619 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-11-07 10:31:33,620 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-11-07 10:31:33,621 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 8 states. [2018-11-07 10:31:33,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:31:33,720 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2018-11-07 10:31:33,722 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-11-07 10:31:33,722 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2018-11-07 10:31:33,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:31:33,723 INFO L225 Difference]: With dead ends: 29 [2018-11-07 10:31:33,724 INFO L226 Difference]: Without dead ends: 24 [2018-11-07 10:31:33,724 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 36 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-11-07 10:31:33,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-11-07 10:31:33,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-11-07 10:31:33,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-11-07 10:31:33,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-11-07 10:31:33,729 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 21 [2018-11-07 10:31:33,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:31:33,729 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-11-07 10:31:33,729 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-11-07 10:31:33,730 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-11-07 10:31:33,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-11-07 10:31:33,730 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:31:33,731 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:31:33,731 INFO L423 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:31:33,731 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:31:33,731 INFO L82 PathProgramCache]: Analyzing trace with hash -1908287044, now seen corresponding path program 6 times [2018-11-07 10:31:33,731 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:31:33,732 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:31:33,732 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 10:31:33,733 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:31:33,733 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:31:33,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:31:34,091 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:31:34,092 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:31:34,092 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:31:34,092 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:31:34,092 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:31:34,092 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:31:34,092 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 10:31:34,102 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 10:31:34,102 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 10:31:34,111 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 10:31:34,111 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 10:31:34,114 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:31:34,134 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:31:34,134 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:31:34,331 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:31:34,359 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:31:34,360 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 16 [2018-11-07 10:31:34,360 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:31:34,360 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-11-07 10:31:34,361 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-11-07 10:31:34,361 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-11-07 10:31:34,361 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 9 states. [2018-11-07 10:31:34,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:31:34,423 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2018-11-07 10:31:34,425 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-11-07 10:31:34,426 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 23 [2018-11-07 10:31:34,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:31:34,426 INFO L225 Difference]: With dead ends: 31 [2018-11-07 10:31:34,427 INFO L226 Difference]: Without dead ends: 26 [2018-11-07 10:31:34,427 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 39 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-11-07 10:31:34,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-11-07 10:31:34,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-11-07 10:31:34,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-11-07 10:31:34,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2018-11-07 10:31:34,432 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 23 [2018-11-07 10:31:34,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:31:34,433 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2018-11-07 10:31:34,433 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-11-07 10:31:34,433 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2018-11-07 10:31:34,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-11-07 10:31:34,434 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:31:34,434 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:31:34,434 INFO L423 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:31:34,434 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:31:34,435 INFO L82 PathProgramCache]: Analyzing trace with hash 1082171650, now seen corresponding path program 7 times [2018-11-07 10:31:34,435 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:31:34,436 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:31:34,436 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 10:31:34,436 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:31:34,436 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:31:34,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:31:34,611 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:31:34,611 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:31:34,611 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:31:34,611 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:31:34,612 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:31:34,612 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:31:34,612 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 10:31:34,620 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 10:31:34,620 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 10:31:34,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:31:34,631 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:31:34,640 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:31:34,640 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:31:35,019 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:31:35,039 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:31:35,039 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 18 [2018-11-07 10:31:35,039 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:31:35,040 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-11-07 10:31:35,040 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-11-07 10:31:35,040 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-11-07 10:31:35,040 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 10 states. [2018-11-07 10:31:35,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:31:35,194 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-11-07 10:31:35,197 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-11-07 10:31:35,197 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 25 [2018-11-07 10:31:35,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:31:35,197 INFO L225 Difference]: With dead ends: 33 [2018-11-07 10:31:35,198 INFO L226 Difference]: Without dead ends: 28 [2018-11-07 10:31:35,198 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 42 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-11-07 10:31:35,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-11-07 10:31:35,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2018-11-07 10:31:35,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-11-07 10:31:35,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2018-11-07 10:31:35,203 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 25 [2018-11-07 10:31:35,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:31:35,203 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2018-11-07 10:31:35,203 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-11-07 10:31:35,203 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2018-11-07 10:31:35,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-11-07 10:31:35,204 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:31:35,204 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:31:35,205 INFO L423 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:31:35,205 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:31:35,205 INFO L82 PathProgramCache]: Analyzing trace with hash 1579855560, now seen corresponding path program 8 times [2018-11-07 10:31:35,205 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:31:35,206 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:31:35,206 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 10:31:35,206 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:31:35,206 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:31:35,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:31:35,376 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:31:35,377 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:31:35,377 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:31:35,377 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:31:35,377 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:31:35,377 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:31:35,378 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 10:31:35,388 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 10:31:35,389 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 10:31:58,964 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-11-07 10:31:58,964 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 10:31:59,013 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:31:59,039 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:31:59,039 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:31:59,298 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:31:59,319 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:31:59,320 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2018-11-07 10:31:59,320 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:31:59,320 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-11-07 10:31:59,321 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-11-07 10:31:59,321 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-11-07 10:31:59,321 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 11 states. [2018-11-07 10:31:59,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:31:59,412 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2018-11-07 10:31:59,413 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-11-07 10:31:59,413 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 27 [2018-11-07 10:31:59,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:31:59,414 INFO L225 Difference]: With dead ends: 35 [2018-11-07 10:31:59,414 INFO L226 Difference]: Without dead ends: 30 [2018-11-07 10:31:59,416 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 45 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-11-07 10:31:59,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-11-07 10:31:59,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-11-07 10:31:59,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-11-07 10:31:59,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-11-07 10:31:59,421 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 27 [2018-11-07 10:31:59,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:31:59,421 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-11-07 10:31:59,421 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-11-07 10:31:59,421 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-11-07 10:31:59,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-11-07 10:31:59,422 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:31:59,423 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:31:59,423 INFO L423 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:31:59,423 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:31:59,423 INFO L82 PathProgramCache]: Analyzing trace with hash -1182244082, now seen corresponding path program 9 times [2018-11-07 10:31:59,423 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:31:59,424 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:31:59,425 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 10:31:59,425 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:31:59,425 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:31:59,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:31:59,749 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:31:59,749 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:31:59,750 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:31:59,750 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:31:59,750 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:31:59,750 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:31:59,750 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 10:31:59,760 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 10:31:59,760 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 10:31:59,772 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 10:31:59,772 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 10:31:59,774 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:31:59,789 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:31:59,789 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:32:00,082 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:32:00,103 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:32:00,103 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 22 [2018-11-07 10:32:00,103 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:32:00,104 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-11-07 10:32:00,104 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-11-07 10:32:00,104 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-11-07 10:32:00,105 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 12 states. [2018-11-07 10:32:00,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:32:00,290 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2018-11-07 10:32:00,292 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-11-07 10:32:00,292 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 29 [2018-11-07 10:32:00,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:32:00,293 INFO L225 Difference]: With dead ends: 37 [2018-11-07 10:32:00,293 INFO L226 Difference]: Without dead ends: 32 [2018-11-07 10:32:00,294 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 48 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-11-07 10:32:00,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-11-07 10:32:00,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2018-11-07 10:32:00,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-11-07 10:32:00,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2018-11-07 10:32:00,299 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 29 [2018-11-07 10:32:00,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:32:00,300 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2018-11-07 10:32:00,300 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-11-07 10:32:00,300 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2018-11-07 10:32:00,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-11-07 10:32:00,301 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:32:00,301 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:32:00,301 INFO L423 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:32:00,301 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:32:00,302 INFO L82 PathProgramCache]: Analyzing trace with hash -1270211116, now seen corresponding path program 10 times [2018-11-07 10:32:00,302 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:32:00,302 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:32:00,302 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 10:32:00,303 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:32:00,303 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:32:00,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:32:00,785 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:32:00,785 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:32:00,785 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:32:00,786 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:32:00,786 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:32:00,786 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:32:00,786 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 10:32:00,797 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 10:32:00,797 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 10:32:00,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:32:00,824 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:32:00,890 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:32:00,890 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:32:01,283 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:32:01,304 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:32:01,305 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 24 [2018-11-07 10:32:01,305 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:32:01,305 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-11-07 10:32:01,306 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-11-07 10:32:01,306 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-11-07 10:32:01,306 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 13 states. [2018-11-07 10:32:01,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:32:01,419 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-11-07 10:32:01,420 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-11-07 10:32:01,420 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 31 [2018-11-07 10:32:01,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:32:01,424 INFO L225 Difference]: With dead ends: 39 [2018-11-07 10:32:01,424 INFO L226 Difference]: Without dead ends: 34 [2018-11-07 10:32:01,425 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 51 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-11-07 10:32:01,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-11-07 10:32:01,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2018-11-07 10:32:01,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-11-07 10:32:01,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2018-11-07 10:32:01,431 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 31 [2018-11-07 10:32:01,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:32:01,431 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2018-11-07 10:32:01,431 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-11-07 10:32:01,431 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2018-11-07 10:32:01,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-11-07 10:32:01,432 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:32:01,433 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:32:01,433 INFO L423 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:32:01,433 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:32:01,433 INFO L82 PathProgramCache]: Analyzing trace with hash 92815130, now seen corresponding path program 11 times [2018-11-07 10:32:01,433 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:32:01,434 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:32:01,434 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 10:32:01,435 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:32:01,435 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:32:01,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:32:01,731 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:32:01,732 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:32:01,732 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:32:01,732 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:32:01,732 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:32:01,732 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:32:01,732 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 10:32:01,741 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 10:32:01,741 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 10:33:16,515 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-11-07 10:33:16,515 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 10:33:16,676 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:33:16,963 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:33:16,963 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:33:36,544 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 128 refuted. 4 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:33:36,564 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:33:36,565 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 26 [2018-11-07 10:33:36,565 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:33:36,565 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-11-07 10:33:36,566 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-11-07 10:33:36,566 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=451, Unknown=6, NotChecked=0, Total=650 [2018-11-07 10:33:36,566 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 14 states. [2018-11-07 10:33:36,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:33:36,759 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2018-11-07 10:33:36,760 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-11-07 10:33:36,760 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 33 [2018-11-07 10:33:36,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:33:36,761 INFO L225 Difference]: With dead ends: 41 [2018-11-07 10:33:36,762 INFO L226 Difference]: Without dead ends: 36 [2018-11-07 10:33:36,763 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 53 SyntacticMatches, 3 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 20.0s TimeCoverageRelationStatistics Valid=193, Invalid=451, Unknown=6, NotChecked=0, Total=650 [2018-11-07 10:33:36,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-11-07 10:33:36,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-11-07 10:33:36,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-11-07 10:33:36,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2018-11-07 10:33:36,767 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 33 [2018-11-07 10:33:36,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:33:36,768 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2018-11-07 10:33:36,768 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-11-07 10:33:36,768 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2018-11-07 10:33:36,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-11-07 10:33:36,769 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:33:36,769 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:33:36,769 INFO L423 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:33:36,769 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:33:36,770 INFO L82 PathProgramCache]: Analyzing trace with hash -3987744, now seen corresponding path program 12 times [2018-11-07 10:33:36,770 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:33:36,771 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:33:36,771 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 10:33:36,771 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:33:36,771 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:33:36,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:33:37,187 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:33:37,187 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:33:37,187 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:33:37,187 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:33:37,188 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:33:37,188 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:33:37,188 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 10:33:37,196 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 10:33:37,196 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 10:33:37,207 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 10:33:37,207 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 10:33:37,211 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:33:37,230 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:33:37,230 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:33:37,905 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:33:37,925 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:33:37,925 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2018-11-07 10:33:37,925 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:33:37,925 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-11-07 10:33:37,926 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-11-07 10:33:37,926 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-11-07 10:33:37,927 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 15 states. [2018-11-07 10:33:38,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:33:38,116 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2018-11-07 10:33:38,123 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-11-07 10:33:38,123 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 35 [2018-11-07 10:33:38,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:33:38,124 INFO L225 Difference]: With dead ends: 43 [2018-11-07 10:33:38,124 INFO L226 Difference]: Without dead ends: 38 [2018-11-07 10:33:38,125 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 57 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-11-07 10:33:38,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2018-11-07 10:33:38,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2018-11-07 10:33:38,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-11-07 10:33:38,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2018-11-07 10:33:38,132 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 35 [2018-11-07 10:33:38,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:33:38,132 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2018-11-07 10:33:38,132 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-11-07 10:33:38,133 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2018-11-07 10:33:38,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-11-07 10:33:38,134 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:33:38,135 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:33:38,135 INFO L423 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:33:38,135 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:33:38,135 INFO L82 PathProgramCache]: Analyzing trace with hash 1457730854, now seen corresponding path program 13 times [2018-11-07 10:33:38,135 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:33:38,139 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:33:38,139 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 10:33:38,139 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:33:38,139 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:33:38,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:33:38,712 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:33:38,713 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:33:38,713 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:33:38,713 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:33:38,713 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:33:38,713 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:33:38,713 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 10:33:38,722 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 10:33:38,722 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 10:33:38,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:33:38,735 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:33:38,776 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:33:38,777 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:33:39,424 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:33:39,444 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:33:39,444 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 30 [2018-11-07 10:33:39,444 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:33:39,444 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-11-07 10:33:39,445 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-11-07 10:33:39,445 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-11-07 10:33:39,445 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 16 states. [2018-11-07 10:33:39,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:33:39,607 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2018-11-07 10:33:39,607 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-11-07 10:33:39,608 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 37 [2018-11-07 10:33:39,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:33:39,609 INFO L225 Difference]: With dead ends: 45 [2018-11-07 10:33:39,609 INFO L226 Difference]: Without dead ends: 40 [2018-11-07 10:33:39,610 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 60 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-11-07 10:33:39,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-11-07 10:33:39,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2018-11-07 10:33:39,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-11-07 10:33:39,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2018-11-07 10:33:39,616 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 37 [2018-11-07 10:33:39,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:33:39,616 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2018-11-07 10:33:39,616 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-11-07 10:33:39,616 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2018-11-07 10:33:39,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-11-07 10:33:39,617 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:33:39,618 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:33:39,618 INFO L423 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:33:39,618 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:33:39,618 INFO L82 PathProgramCache]: Analyzing trace with hash 1714997740, now seen corresponding path program 14 times [2018-11-07 10:33:39,618 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:33:39,619 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:33:39,619 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 10:33:39,619 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:33:39,619 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:33:39,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:33:40,434 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:33:40,435 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:33:40,435 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:33:40,435 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:33:40,435 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:33:40,435 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:33:40,436 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 10:33:40,452 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 10:33:40,452 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 10:33:51,750 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-11-07 10:33:51,750 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 10:33:51,810 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:33:51,841 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:33:51,841 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:33:54,484 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:33:54,503 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:33:54,504 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 20] total 35 [2018-11-07 10:33:54,504 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:33:54,504 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-11-07 10:33:54,504 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-11-07 10:33:54,505 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=307, Invalid=883, Unknown=0, NotChecked=0, Total=1190 [2018-11-07 10:33:54,505 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 17 states. [2018-11-07 10:33:54,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:33:54,693 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2018-11-07 10:33:54,693 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-11-07 10:33:54,693 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 39 [2018-11-07 10:33:54,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:33:54,694 INFO L225 Difference]: With dead ends: 47 [2018-11-07 10:33:54,695 INFO L226 Difference]: Without dead ends: 42 [2018-11-07 10:33:54,696 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 59 SyntacticMatches, 3 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=307, Invalid=883, Unknown=0, NotChecked=0, Total=1190 [2018-11-07 10:33:54,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-11-07 10:33:54,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-11-07 10:33:54,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-11-07 10:33:54,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2018-11-07 10:33:54,701 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 39 [2018-11-07 10:33:54,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:33:54,702 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2018-11-07 10:33:54,702 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-11-07 10:33:54,702 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2018-11-07 10:33:54,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-11-07 10:33:54,703 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:33:54,703 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:33:54,703 INFO L423 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:33:54,703 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:33:54,704 INFO L82 PathProgramCache]: Analyzing trace with hash -159627982, now seen corresponding path program 15 times [2018-11-07 10:33:54,704 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:33:54,704 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:33:54,704 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 10:33:54,705 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:33:54,705 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:33:54,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:33:55,019 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:33:55,020 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:33:55,020 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:33:55,020 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:33:55,020 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:33:55,020 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:33:55,020 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 10:33:55,028 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 10:33:55,028 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 10:33:55,042 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 10:33:55,042 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 10:33:55,044 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:33:55,077 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:33:55,077 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:33:55,610 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:33:55,629 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:33:55,630 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 34 [2018-11-07 10:33:55,630 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:33:55,630 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-11-07 10:33:55,631 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-11-07 10:33:55,632 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2018-11-07 10:33:55,632 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 18 states. [2018-11-07 10:33:55,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:33:55,837 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2018-11-07 10:33:55,837 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-11-07 10:33:55,837 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 41 [2018-11-07 10:33:55,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:33:55,838 INFO L225 Difference]: With dead ends: 49 [2018-11-07 10:33:55,838 INFO L226 Difference]: Without dead ends: 44 [2018-11-07 10:33:55,840 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 66 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2018-11-07 10:33:55,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2018-11-07 10:33:55,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2018-11-07 10:33:55,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-11-07 10:33:55,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2018-11-07 10:33:55,845 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 41 [2018-11-07 10:33:55,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:33:55,845 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2018-11-07 10:33:55,845 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-11-07 10:33:55,846 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2018-11-07 10:33:55,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-11-07 10:33:55,846 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:33:55,847 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:33:55,848 INFO L423 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:33:55,848 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:33:55,849 INFO L82 PathProgramCache]: Analyzing trace with hash -2083649800, now seen corresponding path program 16 times [2018-11-07 10:33:55,849 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:33:55,849 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:33:55,850 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 10:33:55,850 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:33:55,850 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:33:55,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:33:56,193 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:33:56,194 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:33:56,194 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:33:56,194 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:33:56,194 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:33:56,194 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:33:56,194 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 10:33:56,212 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 10:33:56,213 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 10:33:56,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:33:56,229 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:33:56,256 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:33:56,256 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:33:56,950 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:33:56,970 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:33:56,970 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 36 [2018-11-07 10:33:56,970 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:33:56,971 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-11-07 10:33:56,971 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-11-07 10:33:56,971 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=358, Invalid=902, Unknown=0, NotChecked=0, Total=1260 [2018-11-07 10:33:56,972 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 19 states. [2018-11-07 10:33:57,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:33:57,368 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2018-11-07 10:33:57,368 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-11-07 10:33:57,368 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 43 [2018-11-07 10:33:57,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:33:57,369 INFO L225 Difference]: With dead ends: 51 [2018-11-07 10:33:57,369 INFO L226 Difference]: Without dead ends: 46 [2018-11-07 10:33:57,370 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 69 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=358, Invalid=902, Unknown=0, NotChecked=0, Total=1260 [2018-11-07 10:33:57,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-11-07 10:33:57,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2018-11-07 10:33:57,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-11-07 10:33:57,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2018-11-07 10:33:57,377 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 43 [2018-11-07 10:33:57,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:33:57,378 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2018-11-07 10:33:57,378 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-11-07 10:33:57,378 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2018-11-07 10:33:57,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-11-07 10:33:57,379 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:33:57,379 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:33:57,379 INFO L423 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:33:57,379 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:33:57,379 INFO L82 PathProgramCache]: Analyzing trace with hash 62287678, now seen corresponding path program 17 times [2018-11-07 10:33:57,380 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:33:57,380 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:33:57,380 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 10:33:57,380 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:33:57,381 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:33:57,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:33:57,928 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:33:57,929 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:33:57,929 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:33:57,929 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:33:57,929 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:33:57,929 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:33:57,929 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 10:33:57,939 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 10:33:57,939 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown